看我的演示。那个 ^H 就是退格符,在终端上由 Ctrl-v Ctrl-h 输入的。
^H
sh10079 ~tmp >>> cat > test te^Hst 10080 ~tmp >>> col < test | xxd 0000000: 7465 0873 740a te.st. 10081 ~tmp >>> col -b < test | xxd 0000000: 7473 740a tst.
sh
10079 ~tmp >>> cat > test te^Hst 10080 ~tmp >>> col < test | xxd 0000000: 7465 0873 740a te.st. 10081 ~tmp >>> col -b < test | xxd 0000000: 7473 740a tst.